Preheat oven to 350 degrees.Tear off a sheet of foil (about 8x12 inches).Place garlic halves onto the foil.Drizzle with olive oil and season with salt & pepper.Wrap the garlic & jalepenos into a foil packet and place in preheated oven.Bake for 30 - 45 minutes; set aside to cool.Meanwhile, boil a pot of water and add chopped potatoes.Cook potatoes until softened and drain.Place potatoes into a large bowl.Add butter, half & half, salt & pepper to taste.When cooled, squeeze garlic out of paper wrappings and place into large bowl.Mash potatoes with all ingredients until you reach your desired consistency.Add more butter/half & half if preferred.Garnish with chopped chives before serving.